<template>
  <div class="app-container">
    <el-form label-width="120px">
      <el-form-item label="信息描述">
        <el-tag type="info">excel模板说明</el-tag>
        <el-tag>
          <i class = "el-icon-download"/>
          <a :href="'/static/01.xlsx'">点击下载模板</a>
        </el-tag>
      </el-form-item>

      <el-form-item label="选择Excel">
        <el-upload
          ref="upload"
          :auto-upload="false"
          :on-success="fileUploadSuccess"
          :on-error="fileUploadError"
          :disabled="importBtnDisabled"
          :limit="1"
          :action="BASE_API+'/eduservice/edu-subject/addSubject'"
          name="file"
          accept="application/vnd.ms-excel">
          <!-- application/vnd.ms-excel 表示只接受excel -->
          <el-button slot="trigger" size="small" type="primary">选取文件</el-button>

          <el-button
            :loading="loading"
            style="margin-left: 10px;"
            size="small"
            type="success"
            @click="submitUpload"
            >{{ fileUploadBtnText }}</el-button
          >
          <div slot="tip" class="el-upload__tip">
            只能上传Excel文件。
          </div>
        </el-upload>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>

export default {
  data() {
    // 定义数据变量，初始值
    return {
      BASE_API: process.env.BASE_API, // 获取BASE_API的值
      // OSS_PATH: process.env.OSS_PATH,
      fileUploadBtnText: "上传到服务器", // 上传组件 key
      importBtnDisabled: false,
      loading: false
    };
  },
  created() {},
  methods: {
    submitUpload() {
      this.importBtnDisabled = true
      this.loading = true
      // Vue写法
      this.$refs.upload.submit()
    },
    fileUploadSuccess(response) {

      this.loading = false
      this.$message({
        type: 'success',
        message: '添加课程成功'
      })
      // 跳转到课程列表
      // 路由跳转
      this.$router.push({ path: "/subject/list" });
    },
    fileUploadError() {
      this.loading = false
      this.$message({
        type: 'error',
        message: '添加课程失败'
      })
      
    }

  }
};
</script>
